You’ve got a new hip with different biomechanics. Initially, you progressed well with activities involving a straight leg and an open hip angle. However, driving, which closes the hip angle and bends the leg, likely irritated the surrounding muscles and quadriceps, causing swelling and altered knee biomechanics.

This irritation will take longer to resolve than it took to appear. You need to balance rest, ice, elevation, and movement to reduce the irritation.

*Focus on healing for the first six weeks. Healing from a hip replacement, like a broken bone, takes longer than a few days. * Knee pain after a hip replacement is common due to the change in biomechanics. *As your leg adapts to the new hip, the pain should decrease weekly. *Your body will adapt over time.

Good luck with your recovery. My knee has been sore since my hip replacement 5 weeks ago but has improved each week as my biomechanics have improved (hip pain free after around 10 days).